Find a way to voronoi structure
Unfortunately there is no way to do this entirely procedurally at the moment, as far as I know. You have to apply most modifiers and preform some Edit Mode operations.




Create a base mesh with whatever starting shape you want.
Ass a Subdivision modifier set to Simple to said object
Adjust the number of subdivisions as desired to obtain a mesh density that suits your needs
Now add a Decimate modifier and turn on the Triangulate option
Adjust the ratio until you obtain a desirable pattern
Add one more Subdivision modifier set to Catmull-Clark with only one subdivision
Once satisfied with the results apply all modifiers
Now in edit mode you will have to preform a repeated sequence of actions to delete all undesirable vertex

Select one "central vertex" from the generated "cells" pattern with more than 4 connecting edges, press Shift + G to select similar and choose Amount of connecting edges option. Erase all selected with the option Dissolve Vertex
Repeat this process until you end up with "clean" voronoi cells leaving the vertex with four connecting edges for last





As last step select all "side vertex" that are only connected to two edges and dissolve them as well so you end up with "simple voronoi cells".





Now in face selection mode inset them all using the Individual option, adjust amount as desired. You can at this point optionally add a Wireframe modifier instead of insetting, if you don't care about adding a solid thickness or if different your wires will have a circular section.
Once done exit edit mode and add modifiers like Solidify to add thickness and a Subdivision modifier set to Catmull-Clark for a smooth appearence. Adjust order to achieve desired effect


These last two modifiers can be left "live" so you can control thickess and smoothness procedurally.